【摘要】 将盛土圆筒埋入天然土中,对非饱和土柱冻结期间地下水入流量进行了历时五年的现场观测。观测表明,冻结期间地下水入流总量,在重粉质砂壤土中当地下水位埋深为1.0和2.0m时分别达到最小值和最大值;在重粘土中当地下水位埋深为1.5m时达到最大值。入流通量与冻结历时关系曲线具有一个峰值,峰值出现时间随地下水位增大而滞后。更多还原

【Abstract】 Sandy silt and silty clay with the dry density of 1.38-1.40 g/cm3 were packed in the steel cylinders. The cylinders were open at the top and sealed at the bottom and buried into ground. The soil columns in the cylinders had a water supply with constant groundwater tables and were freezing under the natural conditions. The field observations lasted 5 years. It was found that the total amount of water intake flow during freezing was lowest and highest in the sandy silt when the depth of groundwater table was ] .0 and 2.0 m, respectively, and was highest in the silty clay when the depth of groundwater table was 1.5 m. The curve of the water intake flux vs. the elapsed time of freezing had a peak value. With the increase in depth of groundwater table, the time when the peak value occured was delayed. The relationships between the water intake flux during freezing and the elapsed time and between the water intake flux during freezing and the freezing rate could be expressed in the exponential form.更多还原